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on the package for Alts is the scale the cars are in, 1:24. So going by that, I would guess you would use a 1:24 model, or a 1:25, depending on how you want to work it. Sometimes larger vehicles are scaled down to match the size of a 1:24. so for standard cars, use 1:24 or 25, and for trucks, it can vary.

Classics are a different story. You would need to figure out what size the orig character was. I'm going to guess the deluxe classics cars are 1:32?? I'm not 100% sure on that one.

I've used this before..http://jimbobwan.com/scalcalc.htm
you have to know the "real life" size to do it, but it's been a great tool for me. Also, you have to play around with the scale a bit to find out what your going for. But i would start with your 1/32, and then make changes accordingly. if you had a real life dimension I could fiddle wiht it to get you started in the right direction.
let me know.

The tricky thing is when you're reshelling, a specific scale doesn't always work, it's the dimensions that are more important. If you want to fit, say a Beetle model kit to an Alt Mustang mould for instance (not that you're likely to), a 1:24 kit would be far too small for the chassis - you'd probably need a model kit scaled at 1:20 (I'm guessing, of course, I don't actuallyknow the relative dimensions of a Beetle and a Mustang )

So it really depends on what TF base you plan to use and what model of car you want to fit onto it...